+" Author: Baabelfish
+" Description: Typechecking for nim files
+
+let s:end_col_patterns = [
+\ '\v''([^'']+)'' is declared but not used.*',
+\ '\videntifier expected, but found ''([^'']+)''',
+\ '\vimported and not used: ''([^'']+)''.*',
+\ '\vundeclared identifier: ''([^'']+)''',
+\ '\v''([^'']+)'' cannot be assigned to',
+\ '\vredefinition of ''([^'']+)'';',
+\]
+
+function! ale_linters#nim#nimcheck#Handle(buffer, lines) abort
+ let l:buffer_filename = fnamemodify(bufname(a:buffer), ':p:t')
+ let l:pattern = '^\(.\+\.nim\)(\(\d\+\), \(\d\+\)) \(.\+\)'
+ let l:output = []
+
+ for l:match in ale#util#GetMatches(a:lines, l:pattern)
+ " Only show errors of the current buffer
+ " NOTE: Checking filename only is OK because nim enforces unique
+ " module names.
+ let l:temp_buffer_filename = fnamemodify(l:match[1], ':p:t')
+
+ if l:buffer_filename isnot# '' && l:temp_buffer_filename isnot# l:buffer_filename
+ continue
+ endif
+
+ let l:item = {
+ \ 'lnum': l:match[2] + 0,
+ \ 'col': l:match[3] + 0,
+ \ 'text': l:match[4],
+ \ 'type': 'W',
+ \}
+
+ " Extract error type from message of type 'Error: Some error message'
+ let l:error_match = matchlist(l:item.text, '^\(.\{-}\): \(.\+\)$')
+
+ if !empty(l:error_match)
+ if l:error_match[1] is# 'Error'
+ let l:item.type = 'E'
+ let l:item.text = l:error_match[2]
+ elseif l:error_match[1] is# 'Warning'
+ \|| l:error_match[1] is# 'Hint'
+ let l:item.text = l:error_match[2]
+ endif
+ endif
+
+ let l:code_match = matchlist(l:item.text, '\v^(.+) \[([^ \[]+)\]$')
+
+ if !empty(l:code_match)
+ let l:item.text = l:code_match[1]
+ let l:item.code = l:code_match[2]
+ endif
+
+ " Find position end_col.
+ for l:col_match in ale#util#GetMatches(l:item.text, s:end_col_patterns)
+ let l:item.end_col = l:item.col + len(l:col_match[1]) - 1
+ endfor
+
+ call add(l:output, l:item)
+ endfor
+
+ return l:output
+endfunction
+
+
+function! ale_linters#nim#nimcheck#GetCommand(buffer) abort
+ return 'nim check --verbosity:0 --colors:off --listFullPaths %s'
+endfunction
+
+
+call ale#linter#Define('nim', {
+\ 'name': 'nimcheck',
+\ 'executable': 'nim',
+\ 'output_stream': 'both',
+\ 'command': function('ale_linters#nim#nimcheck#GetCommand'),
+\ 'callback': 'ale_linters#nim#nimcheck#Handle',
+\ 'lint_file': 1,
+\})